
.calculator .row button{
    height: 3rem;
    width: 3rem;
}
.text-clear{
    width: 9rem !important;
}
.text-0{
    width: 6rem !important;
}
.output{
    border: 1px solid #ccc;
    height: 3em;
    width: 12rem;
    position: relative;
}
.output span{
  position:absolute;
  right: 0;
  bottom: 0;
}